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An improved strategy to synthesize graphite oxide with controllable interlayer spacing as coatings for anticorrosion application
Author(s) -
Zheng Hao,
Cheng Yusheng,
Zhao Ranran,
Ye Ying,
Chen Jianfang
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49823
Subject(s) - materials science , graphene , raman spectroscopy , oxide , scanning electron microscope , graphite , x ray photoelectron spectroscopy , chemical engineering , coating , fourier transform infrared spectroscopy , nanocomposite , graphite oxide , transmission electron microscopy , aqueous solution , corrosion , analytical chemistry (journal) , nanotechnology , composite material , organic chemistry , chemistry , metallurgy , optics , physics , engineering
A facile method to synthesize nanoscale graphene oxide (GO) with controllable interlayer spacing was carried out using two‐step oxidation process and much less acid to improve the efficiency of the oxidation. The X‐ray diffraction results demonstrated that GO had been successfully prepared from graphite because of disappearance of characteristic peaks of pristine graphite at about 2θ = 26.5° along with appearance of a sharp major peak of GO at about 2θ = 9.4°. The increased basal spacing d 001 of as‐prepared GO could reach as high as 9.39 Å, suggesting higher degree of oxidation than that prepared by the classical Hummers' synthesis, and characterization results from Fourier transform infrared spectrometer, X‐ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy further confirmed this conclusion. The influence of GO on anti‐corrosion performance of nanocomposite coatings composited with the 2,5‐dimethoxyaniline (DMA) conductive polymer was examined via potentiodynamic polarization curve tests in 3.5 wt% NaCl aqueous solution. The results demonstrated that the incorporation of GO significantly decreased the corrosion current density ( i corr = 2.62 μA/cm 2 ) in the case of GO‐PDMA coating, reflecting excellent physical isolation of GO and its synergistic effect with PDMA against the infiltration of water and corrosive electrolyte.